Add dexdump output for dex comparator

dexdump tool from dexdump package, can dump information&disassemble of .dex file, for example by command:

dexdump -a -d -f -h -i classes.dex will output to stdout -o can be used to specify filename, explanation of relevant arguments from --help output:

 -a : display annotations
 -d : disassemble code sections
 -f : display summary information from file header
 -h : display file header details
 -i : ignore checksum failures
 -o : output file name (defaults to stdout)

currently dex comparator will decompile the dex file to java which sometimes won't be able to detect differences, thus disassemble output is needed.